Electromagnetic Switching Valve Venting for Foreign Matter Control
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Solution Overview
Problem
Conventional electromagnetic switching valves face issues with foreign matter entering the plunger side of the actuator, leading to wear or locking, and the structure becomes complex when trying to prevent this, often resulting in dampering actions that hinder normal operation.
Innovation Solution
The electromagnetic switching valve design includes a transmission member with specific internal passages and openings that restrict foreign matter entry while allowing hydraulic oil circulation, featuring a small-diameter tubular part inserted through the stator's insertion hole and a large-diameter tubular part within the sleeve, with strategically placed openings and passages to facilitate smooth operation and prevent foreign matter ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the actuator breathing passage is made narrow to prevent foreign matter entry, then foreign matter protection is improved, but dampering action occurs and plunger operation is hindered
Solution Approach 1:
The breathing passage is segmented into two separate passages: a first breathing passage for oil supply and a second breathing passage for oil discharge. This segmentation allows each passage to be optimized independently - the supply passage can be narrow for foreign matter protection while the discharge passage provides sufficient flow area to prevent dampering, thus resolving the contradiction between foreign matter protection and smooth plunger operation.
2Ease of operation
If a shaft is provided to transmit driving force, then plunger to spool connection is improved, but foreign matter can enter through shaft breathing holes
Solution Approach 1:
The shaft breathing holes are eliminated entirely by extracting the breathing function from the shaft and relocating it to dedicated breathing passages in the plunger. This removes the vulnerability point where foreign matter could enter through the shaft, while still maintaining the driving force transmission function of the shaft.
Solution Approach 2:
The first and second breathing passages act as intermediaries between the hydraulic oil and the plunger interior. These passages are positioned and designed to allow hydraulic oil to reach the plunger for proper operation while preventing foreign matter from entering, thus mediating between the need for oil access and foreign matter protection.
3Device complexity
If the structure is simplified without increasing components, then device complexity is reduced, but foreign matter protection may be compromised
Solution Approach 1:
The plunger is given multiple functions: it serves as both the electromagnetic actuator component and as the housing for the breathing passages. By making the plunger multi-functional, the design achieves foreign matter protection through dedicated breathing passages without adding separate protective components, thus maintaining structural simplicity while improving protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies the structure without increasing components, effectively preventing foreign matter from reaching the plunger and ensuring normal operation of the electromagnetic actuator by circulating hydraulic oil and restricting foreign matter entry, thus maintaining the actuator's functionality.
Implementation Method 1
an electromagnetic actuator, including a plunger having a through passage which extends in the axis direction and a stator exerting a magnetomotive force on the plunger
Data Source
AI summary
An electromagnetic switching valve includes: a sleeve; a spool; an electromagnetic actuator, including a plunger having a through passage and a stator exerting a magnetomotive force on the plunger; and a transmission member of a tubular shape, interposed between the plunger and the spool and transmitting a driving force. The stator includes an insertion hole through which the transmission member is inserted. The transmission member includes: a facing wall facing the through passage; a first internal passage formed closer to the plunger than the facing wall and communicating with the through passage; a first opening formed closer to the plunger than the insertion hole and opening the first internal passage in a radial direction; second internal passages formed closer to the spool than the facing wall; and second openings formed closer to the spool than the insertion hole and opening the second internal passages in the radial direction.